Find the Maximum and Minimum Values Of $f ( x ) = \left| 9 - x ^ { 2 } \right| \text { where } - 2 \leq x \leq 4$

Find the maximum and minimum values of $f ( x ) = \left| 9 - x ^ { 2 } \right| \text { where } - 2 \leq x \leq 4$